Sidelink Synchronization Source Selection for V2X

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Solution Overview

Problem

Current device-to-device (D2D) communication systems in wireless telecommunications, particularly in vehicle-to-everything (V2X) contexts, face delays in data exchange due to synchronization source selection processes, which can be detrimental in emergency situations where quick communication is critical.

Innovation Solution

Implementing sidelink synchronization procedures where terminal devices can transmit high-priority synchronisation signalling to override default prioritization, allowing direct synchronization between devices even when out of network coverage, and using reserved radio resources for emergency communications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminal devices use default synchronization source selection procedures, then network coverage and synchronization stability are improved, but synchronization delay increases which is unacceptable in emergency situations

Engineering Contradiction:

Improvesynchronization stabilityVSAvoidsynchronization delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The synchronization source selection is made dynamic by allowing terminal devices to switch between default procedures and direct synchronization based on detected events. When a predefined event is detected, the device dynamically changes its synchronization behavior to use direct synchronization from another terminal device, thereby reducing delay while maintaining stability in normal conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The synchronization approach changes based on the detection of predefined events. The system transitions between different synchronization modes (default procedure vs. direct synchronization) by changing the parameter of synchronization source selection, allowing optimization between stability and speed depending on the operational context

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If terminal devices perform synchronization source selection procedures, then synchronization accuracy is improved, but communication speed deteriorates due to the time-consuming selection process

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidcommunication speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

Terminal devices perform preliminary detection of predefined events and prepare for direct synchronization in advance. By detecting events and initiating direct synchronization procedures proactively, the system avoids the time-consuming default selection process while maintaining synchronization accuracy through event-driven activation

Inventive Principle:

Principle #10Preliminary action

3Reliability

If terminal devices rely on network infrastructure for synchronization, then synchronization reliability is improved, but device autonomy deteriorates when out of network coverage

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoiddevice autonomy

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The terminal device is designed with multi-functionality to operate in both network-covered and out-of-coverage scenarios. It can perform both default synchronization source selection (when in coverage) and direct synchronization (when out of coverage), making the device universally adaptable to different operational environments while maintaining synchronization reliability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The terminal device enables self-service synchronization by directly synchronizing with another terminal device when out of network coverage. This autonomous self-service capability allows the device to maintain synchronization reliability without relying on network infrastructure, thereby improving device autonomy in remote or emergency situations

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11690036B2Wireless telecommunications system including a first terminal device and a second terminal device wherein the second terminal achieves synchronisation for receiving data from the first terminal using synchronisation signalling transmitted by the first terminal or another network entity

Publication Date: 2023.06.27 SONY GROUP CORP

AI summary

A wireless telecommunications system including first and second terminal devices operable to communicate with one another in a synchronized device-to-device manner. The second terminal device is operable to selectively achieve synchronization for receiving data transmissions from the first terminal device using direct synchronization signalling transmitted by the first terminal device or indirect synchronization signalling transmitted by another network entity, such as a base station. The second terminal device is configured to preferentially seek indirect synchronization over direct synchronization, unless the second terminal device detects synchronization signalling transmitted by the first terminal device is associated with a predefined characteristic that indicates the synchronization signalling transmitted by the first terminal device is high priority synchronization signalling, in which case the second terminal device is configured to preferentially seek synchronization using the high priority direct synchronization signalling from the first terminal device over indirect synchronization signalling transmitted by the other network entity.